Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect wires and tubes from APS, making a note of the connections
Measurement:
Note the operating pressure indicated on the pressure switch.
Connect the air pressure switch charge kit to
+ve connection on the air pressure switch.
Ensure the performance tester reads 0mb.
Increase the pressure via the syringe to that indicated on the
pressure switch. Continuity should then be measured across
the common and normally open connections at the APS
(where the two wires were previously connected).
Notes:
100Pa (Pascals) = 1millibar
If continuity is not measured it is permissible
to increase the pressure by up to 50%
APS may differ in appearance but test remains the same.
Connect the air pressure switch charge kit to
+ve connection on the air pressure switch.
Ensure the performance tester reads 0mb.
Increase the pressure via the syringe to that indicated on the
pressure switch. Continuity should then be measured across
the common and normally open connections at the APS
(where the two wires were previously connected).
Notes:
100Pa (Pascals) = 1millibar
If continuity is not measured it is permissible
to increase the pressure by up to 50%
APS may differ in appearance but test remains the same.
Isolate as per TOPs P4
and refit as necessary